This is an example of an email that has problems - does this give any clues?
From: link deleted Tax Advice Network
To: ***EMAIL DELETED FOR PRIVACY***
Date: Thu, 24 Jul 2008 19:16:03 +0100
Subject: Confirmation Message from Tax Advice Network site.
<HTML xmlns:eXclaimer="link deleted" xmlns:msxsl="urn:schemas-microsoft-com
slt" xmlns:exc="link deleted">
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-16">
</HEAD>
<BODY >
<DIV><style type="text/css">
<!--
a.lnk { font-family: Verdana, Arial, Helvetica, sans-serif; color: #FF9900; text-decoration: underline;}
a.lnk:hover { font-family: Verdana, Arial, Helvetica, sans-serif; color: #FFCCCC; text-decoration: none;}
-->
</style>
<span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; line-height: 16px; color: #666666;">
<table border="0" cellspacing="3" cellpadding="0" style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; line-height: 16px; color: #666666;">
<tr>
<td>Thank you for registering on the Tax Advice Network.</td>
</tr>
<tr>
<td>Please <a href='link deleted>click here.</a> to confirm your registration and begin using the site.</td>
</tr>
</table>
</span>
All appears ok to me?